Malicious PDF — malware analysis report

Static analysis result for SHA-256 c34e4726dcd91f62…

MALICIOUS

PDF

41.8 KB Created: 2020-10-09 16:02:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 7c0b6c8b505da191e5a13a27597395a8 SHA-1: bc73e0693224cf5adc4ef6cb0ff4dd1d17e259a8 SHA-256: c34e4726dcd91f6252fdbf95efa34c532956eba78ca689f6ba23a380daa625a7
194 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://gettraff.ru/strik?keyword=avent+manual+breast+pump+babies+r+us In PDF document text
    • http://files.varunvelhankar.com/uploads/1/3/0/8/130874180/c8b54.pdfIn PDF document text
    • http://files.ketsup-pinoy.com/uploads/1/3/2/8/132814155/pitiresoz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a266616-a607-4f1a-af3f-8803a9aac3d6/58098336509.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93cebfaa-dd81-43f8-87f0-74f07c9af272/65523448164.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fcf54284-1e06-42c4-a153-b5a8e3550eed/42838217506.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/533b47e3-5826-407b-952e-1923faa61d67/panagodirina.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42c7abb9-63b2-4f3a-ae09-e8a142c2317d/rolonujupiwu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74132250-3a7c-490f-8116-6eb7a32e1d2f/95164762843.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4be33c72-77a4-4b22-9319-6877e36e8f5c/61263684626.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78ef9a3f-10cd-4f67-bea5-b664633a896f/15323126001.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0479/6625/7308/files/cooking_fever_tips_for_more_gems.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0461/7168/5027/files/dukuminolalus.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0477/1033/9228/files/lying_in_wait_crime.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3831/7471/files/80972522637.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006575.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6575 5156 bytes
SHA-256: e04cad84c5b2c9da906841b35e49ad8f13188de5b374cea2539f2e442550cb33
font_01_sfnt_off000076de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x76DE 10428 bytes
SHA-256: d45aae82c73849667d4a7277d0a89573e2d05092200d59f1e97827f939106449

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